| /**************************************************************************** |
| ** |
| ** Copyright (C) 2014 NVIDIA Corporation. |
| ** Copyright (C) 2019 The Qt Company Ltd. |
| ** Contact: https://www.qt.io/licensing/ |
| ** |
| ** This file is part of Qt 3D Studio. |
| ** |
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| ** GNU General Public License Usage |
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| ** General Public License version 3 or (at your option) any later version |
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| ****************************************************************************/ |
| |
| float gradientInterpolate( in int interpolationMode, in float value ) |
| { |
| switch( interpolationMode ) |
| { |
| case gradient_interpolation_linear : |
| return( value ); |
| case gradient_interpolation_off : |
| return( 0.0 ); |
| case gradient_interpolation_ease_in : |
| return( 1.0 - pow( 1.0 - value, 2.0/3.0 ) ); |
| case gradient_interpolation_ease_out : |
| return( pow( value, 2.0/3.0 ) ); |
| case gradient_interpolation_ease_in_out : |
| return( ( value <= 0.5 ) |
| ? 0.5 * pow( 2.0 * value, 2.0/3.0 ) |
| : 0.5 + 0.5 * ( 1.0 - pow( 2.0 * ( 1.0 - value ), 2.0/3.0 ) ) ); |
| default: |
| return( value ); // default is linear |
| } |
| } |
| |
| texture_return gradient3Recolor( in float gradientPositions[3], in vec3 gradientColors[3], in int interpolationModes[3], in int monoSource, in float distortion, in float position ) |
| { |
| texture_return tr; |
| float pos = position + distortion; |
| if ( pos <= gradientPositions[0] ) |
| { |
| tr.tint = gradientColors[0]; |
| } |
| else if ( pos >= gradientPositions[2] ) |
| { |
| tr.tint = gradientColors[2]; |
| } |
| else |
| { |
| int index = ( position < gradientPositions[1] ) ? 0 : 1; |
| float relPos = gradientInterpolate( interpolationModes[index], ( pos - gradientPositions[index] ) / ( gradientPositions[index+1] - gradientPositions[index] ) ); |
| tr.tint = mix( gradientColors[index], gradientColors[index+1], relPos ); |
| } |
| tr.mono = 0.0; |
| return( tr ); |
| } |
| |